AOBOO Ophthalmology & Otolaryngology-HNS common mistakes
AOBOO Ophthalmology & Otolaryngology-HNS · Understand the traps and how to avoid them.
On glaucoma items, choosing the diagnosis or next step based on the single highest intraocular pressure value in the stem while ignoring optic disc and visual field description, or selecting a 'lower the pressure fastest' answer for every elevated-IOP vignette.
Candidates memorize pressure thresholds as a shortcut and treat glaucoma as a numbers-only disease, so they under-weight the structural (cup-to-disc ratio, rim, hemorrhage) and functional (field defect pattern) evidence that actually discriminates open-angle glaucoma, ocular hypertension, and angle-closure.
What to do instead
Before answering, write down the three pillars (IOP, disc, field) and require the chosen answer to be consistent with all three; practice classifying 20 vignettes as ocular hypertension vs. primary open-angle vs. normal-tension vs. angle-closure before selecting management.
Mismatching visual field defect patterns to lesion location in neuro-ophthalmology stems, e.g., labeling a bitemporal defect as a retinal problem or assigning a homonymous hemianopia to the optic nerve.
The chiasm-to-occipital pathway is learned as a list rather than as a spatial map, so candidates cannot localize when the stem gives only a field description plus a subtle finding such as a relative afferent pupillary defect or disc pallor.
What to do instead
Draw the pathway from optic nerve to occipital cortex on scratch paper for every neuro item and mark where the field respects or crosses the vertical midline; memorize the rule that chiasmal and retrochiasmal defects respect the midline while retinal/optic nerve defects do not.
Selecting 'urgent topical antibiotics and follow-up' for a corneal ulcer vignette without addressing the features that mandate culturing, hospitalization, or a different organism-specific regimen (contact lens wear, hypopyon, prior steroid use).
Candidates default to a generic keratitis algorithm and do not extract the risk modifiers from the stem, conflating bacterial, fungal, and acanthamoeba presentations.
What to do instead
Build a one-page decision table keyed to the modifiers (contact lens vs. trauma vs. agricultural exposure vs. chronic topical steroid) and rehearse choosing scrape-and-culture plus fortified therapy vs. antifungal vs. biguanide-based therapy from those triggers alone.
Treating every painful red eye or acute vision loss as a single 'emergency' answer instead of differentiating the time-critical posterior segment diagnoses (retinal artery occlusion, retinal detachment with macular involvement, endophthalmitis) from conditions that can wait.
Candidates learn 'vision loss = emergency' as a slogan and then fail items that test the specific triage step or the correct immediate maneuver, because they never separated the posterior segment emergencies by mechanism.
What to do instead
Make a triage grid of acute vision loss by pain, laterality, fundus finding, and time window, and for each row state the single first action (e.g., immediate referral for macula-on detachment vs. same-day evaluation for central retinal artery occlusion workup).
On otology items, answering with the audiogram pattern label alone and ignoring the tuning fork or exam finding that distinguishes conductive from sensorineural loss, or vice versa.
Candidates over-rely on memorized audiogram shapes and skip the bedside tests (Rinne, Weber) that the stem deliberately includes as the discriminating data point.
What to do instead
For every hearing-loss item, first commit to conductive vs. sensorineural using the physical exam data, then select the audiogram description and management that match; drill 15 items where the audiogram and tuning fork conflict to force reconciliation.
Choosing a vestibular diagnosis or repositioning maneuver without first classifying the nystagmus by direction, latency, fatigability, and duration in the stem.
Candidates jump to 'BPPV = Epley' as a reflex and do not use the nystagmus characteristics that separate peripheral from central causes or identify which canal is involved.
What to do instead
Adopt a fixed reading order for vertigo stems (timing, triggers, nystagmus features, associated neuro signs) and select the canal and maneuver only after stating the classification aloud or in notes.
Recommending surgery or a procedure for chronic rhinosinusitis before documenting failure of maximal medical therapy, or skipping the allergy/medical optimization step the stem implies.
Candidates equate a positive CT or polyp finding with a surgical indication and under-weight the stepwise medical pathway (steroids, saline, antibiotics when indicated, allergy control) that the item is testing.
What to do instead
For every sinus item, explicitly list what medical therapy has been tried and for how long before considering intervention; practice identifying the stem phrase that signals 'failed medical management' versus 'not yet optimized.'
In head and neck oncology items, staging or choosing treatment from tumor size alone while ignoring nodal status, extranodal extension, or subsite-specific behavior.
Candidates memorize T categories and forget that N classification and extranodal extension often drive the answer, especially for adjuvant therapy decisions.
What to do instead
For each head and neck vignette, write T, N, and the high-risk features (extranodal extension, positive margin, perineural invasion) as separate lines before selecting management, and rehearse the indications for adjuvant radiation or chemoradiation from those features.
Managing a pediatric airway or stridor vignette with adult algorithms, or selecting imaging before securing the airway in a child with signs of impending obstruction.
Candidates carry adult priorities (image first, then treat) into pediatric items where the age-specific differential (croup, epiglottitis, foreign body, subglottic stenosis, laryngomalacia) and the airway-first principle change the correct sequence.
What to do instead
For every pediatric stridor item, first assign the age bracket and onset pattern (acute vs. chronic, febrile vs. afebrile, positional), then apply the rule that unstable airway is secured before diagnostic imaging; drill the classic age-specific presentations as a set.
Answering perioperative and osteopathic-principles items by reflex (e.g., routine preoperative testing, blanket antibiotic prophylaxis, or a single 'manipulation' answer) without tying the choice to the patient's specific risk factors and the documented indication.
Candidates treat this domain as low-yield trivia and do not apply the same indication-based reasoning they use clinically, so they miss items testing appropriate testing, prophylaxis timing, or contraindications.
What to do instead
Review the explicit indications and non-indications for common preoperative tests and prophylaxis, and for each item state the indication in one sentence before choosing; if no indication can be stated, the answer is usually to omit the intervention.